Ceiling fan

ABSTRACT

A ceiling fan including a connecting fitting fixed to a ceiling, and a ceiling fan main body suspended from the connecting fitting via a suspension device. The ceiling fan main body includes a motor for rotating a plurality of blades attached in a horizontal direction, a shaft protruding to an upper part of the motor, and a joint portion fixed on an upper part of the shaft. The suspension device includes a first connecting portion capable of being movably mounted on the connecting fitting, and a second connecting portion located in a lower part of the first connecting portion. The joint portion is movably mounted on the second connecting portion.

TECHNICAL FIELD

The present invention relates to a ceiling fan suspended from a ceiling.

BACKGROUND ART

A conventional ceiling fan includes a connecting fitting fixed to aceiling, and a ceiling fan main body suspended from the connectingfitting via a suspension device.

When such a ceiling fan is operated in a state in which it is suspendedfrom a ceiling, a ceiling fan main body may occasionally swing. That isto say, in a conventional ceiling fan, a shaft protruding from the upperpart of the ceiling fan main body is movably anchored to the connectingfitting fixed to a ceiling. However, not-specified swing components inall directions are generated due to vane weight and unbalanced pitch ina ceiling fan, circulation air generated during operation of a ceilingfan main body, outside wind, and the like, causing a ceiling fan mainbody to swing non-constantly.

In such circumstances, conventionally, in order to suppress swing, aceiling fan main body is firmly fixed to a ceiling via a suspensionstructure so as to reduce the swing width of the ceiling fan main body.However, an abnormal noise may occur on a ceiling depending on ceilingstructures.

[Citation List]

[Patent Document 1] Japanese Patent Application Unexamined PublicationNo. H3-294696

SUMMARY OF THE INVENTION

A ceiling fan of the present invention includes a connecting fittingfixed to a ceiling; and a ceiling fan main body suspended from theconnecting fitting via a suspension device. The ceiling fan main bodyincludes a motor for rotating a plurality of blades attached in ahorizontal direction, a shaft protruding to an upper part of the motor,and a joint portion fixed on an upper part of the shaft. The suspensiondevice includes a first connecting portion capable of being movablymounted on the connecting fitting; and a second connecting portionlocated in a lower part of the first connecting portion. The jointportion is movably mounted on the second connecting portion.

Such a ceiling fan has a suspension device provided with two movableconnecting portions between a connecting fitting fixed to a ceiling anda ceiling fan main body. Therefore, the transmission of the vibration ofthe ceiling fan main body during operation is reduced by the two movableconnecting portions. Furthermore, the swing of the ceiling fan main bodyduring operation is partially cancelled by the two movable connectingportions. As a result, the vibration of the ceiling fan main body duringoperation is not easily transmitted to the ceiling, and the swing of theceiling fan main body can be suppressed. Thus, the occurrence of anabnormal noise on the ceiling is reduced significantly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view showing a ceiling fan in accordance with a firstexemplary embodiment of the present invention.

FIG. 2 is a perspective view showing the ceiling fan.

FIG. 3 is a side view showing a ceiling fan in accordance with a secondexemplary embodiment of the present invention.

FIG. 4 is a perspective view showing the ceiling fan.

FIG. 5 is an enlarged view showing a principal part of a suspensiondevice of the ceiling fan.

FIG. 6 is a side view showing a ceiling fan in accordance with a thirdexemplary embodiment of the present invention.

FIG. 7 is a side view showing a ceiling fan in accordance with a fourthexemplary embodiment of the present invention.

FIG. 8 is a development view showing a principal part of a suspensiondevice of the ceiling fan.

FIG. 9 is a development view showing a principal part of a suspensiondevice of a ceiling fan in accordance with a fifth exemplary embodimentof the present invention.

FIG. 10 is a development view showing a principal part of a suspensiondevice of a ceiling fan in accordance with a sixth exemplary embodimentof the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, exemplary embodiments of the present invention aredescribed with reference to drawings.

First Exemplary Embodiment

FIG. 1 is a side view showing a ceiling fan in accordance with a firstexemplary embodiment of the present invention; FIG. 2 is a perspectiveview showing the ceiling fan. Ceiling fan 50 includes connecting fitting6, suspension device 7, and ceiling fan main body 1. Herein, connectingfitting 6 is fixed to ceiling 5. Ceiling fan main body 1 is suspendedfrom connecting fitting 6 via suspension device 7.

Suspension device 7 includes a first connecting portion includinghorizontal axis connecting portion 8 and a second connecting portionincluding horizontal axis connecting portion 9. Herein, the firstconnecting portion can be movably mounted on connecting fitting 6. Thesecond connecting portion is located in the lower part of the firstconnecting portion.

Ceiling fan main body 1 includes motor 3, shaft 4, and joint portion 10.Herein, motor 3 rotates a plurality of blades 2 attached in thehorizontal direction. Shaft 4 protrudes to the upper part of motor 3.Joint portion 10 is fixed to the upper part of shaft 4, and movablymounted on the second connecting portion.

Furthermore, central axis 14 of shaft 4 is defined as Y-axis 11, andcoordinates of the horizontal plane perpendicular to Y-axis 11 aredefined as X-axis 12 and Z-axis 13. Herein, the first connecting portionis rotatable in the direction of X-axis 12 as a rotation axis.Furthermore, the second connecting portion is rotatable in the directionof Z-axis 13 as a rotation axis.

Horizontal axis connecting portion 8 as the first connecting portion haspulley 22 on a columnar axis fixed in the horizontal direction, and ishooked over hook-shaped connecting fitting 6 fixed to ceiling 5.Furthermore, pulley 22 has groove 20 on the center of the peripherythereof and is made of rubber.

Horizontal axis connecting portion 9 forming the second connectingportion includes a columnar axis fixed in the horizontal direction, andis hooked through joint portion 10 having a hole in the upper part ofshaft 4.

That is to say, suspension device 7 has a configuration in which thecolumnar axis of the first connecting portion and the columnar axis ofthe second connecting portion are fixed in a state in which they aredisplaced by 90° in the horizontal direction by using suspension section15.

Therefore, even if not-specified swing components in all directions aregenerated due to the weight of ceiling fan main body 1 and blades 2,unbalanced pitch of blades 2, and air flow and circulation air generatedduring operation, outside wind, and the like, and the swing of ceilingfan main body 1 occurs non-constantly, they are suppressed as follows.That is to say, a swing component in the direction of rotation aroundX-axis 12 as a rotation axis is suppressed by the first connectingportion. Furthermore, a swing component in the direction of rotationaround Z-axis 13 as a rotation axis is suppressed by the secondconnecting portion. In this way, swing components in the directions ofrotation around X-axis 12 and Z-axis 13 can be handled. Therefore, theswing of ceiling fan main body 1 during operation can be suppressed.

Second Exemplary Embodiment

In accordance with a second exemplary embodiment of the presentinvention, the same reference numerals are given to the same elements asin the first exemplary embodiment and the description thereof isomitted, and only different configuration is described. The secondexemplary embodiment of the present invention and the first exemplaryembodiment are different from each other in a configuration of a secondconnecting portion.

FIG. 3 is a side view showing a ceiling fan in accordance with thesecond exemplary embodiment of the present invention. FIG. 4 is aperspective view showing the ceiling fan. FIG. 5 is an enlarged viewshowing a principal part of a suspension device of the ceiling fan.

Suspension device 37 of ceiling fan 51 includes a first connectingportion including horizontal axis connecting portion 8, and a secondconnecting portion holding horizontal plane axis connecting portion 16.The first connecting portion is rotatable in the direction of X-axis 12as a rotation axis. The second connecting portion is hanger 17 holdingball joint 21 b rotatable around a rotation axis on the horizontal planeincluding X-axis 12 and Z-axis 13.

Horizontal axis connecting portion 8 as the first connecting portion haspulley 22 on a columnar axis fixed in the horizontal direction, and ishooked over hook-shaped connecting fitting 6 fixed to ceiling 5.Furthermore, pulley 22 has groove 20 on the center of the peripherythereof and is made of rubber.

Hanger 17 as the second connecting portion has a bowl shape movablyholding ball joint 21 b. Ball joint 21 b forming joint portion 10 has asubstantially hemispherical-shaped surface with groove 20 b providedthereon, and is fixed on the upper part of shaft 4. Furthermore, hanger17 includes notch portion 18 b through which shaft 4 is allowed to passand protrusion 19 b that can be inserted into groove 20 b.

That is to say, suspension device 37 has a configuration in which thecolumnar axis having pulley 22 of the first connecting portion is fixedto hanger 17, and hanger 17 as the second connecting portion holds balljoint 21 b.

With the above-mentioned configuration, a swing component in thedirection of rotation around X-axis 12 as a rotation axis is suppressedby the first connecting portion. Furthermore, a swing component in thedirection of rotation having a rotation axis on the plane includingX-axis 12 and Z-axis 13 is suppressed by the second connecting portionholding ball joint 21 b. As a result, a swing component in the rotationdirection around X-axis 12 as a rotation axis and a swing component inthe direction of rotation having a rotation axis on the horizontal planecan be handled. Therefore, the swing of ceiling fan main body 1 duringoperation can be suppressed.

Furthermore, the swing of ceiling fan main body 1 during operation istransmitted to joint portion 10 fixed to the upper part of shaft 4, thatis, ball joint 21 b, via shaft 4 protruding to the upper part of motor3. Furthermore, the swing is transmitted to the first connecting portionvia hanger 17 as the second connecting portion. In this way, the swingof ceiling fan main body 1 is not transmitted to the first connectingportion and the second connecting portion simultaneously. The swing isfirstly transmitted to the second connecting portion, and then to thefirst connecting portion late. Consequently, in the first connectingportion and the second connecting portion, the swing directions areopposite to each other, the swing of ceiling fan main body 1 arepartially cancelled, and the swing of ceiling fan main body 1 duringoperation can be suppressed.

Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via twoconnecting portions, that is, the first connecting portion and thesecond connecting portion. Therefore, the transmission of the vibrationof ceiling fan main body 1 is suppressed by the two movable connectingportions. As a result, the transmission of the vibration to ceiling 5 issuppressed. Thus, the occurrence of an abnormal noise on ceiling 5 canbe suppressed.

Furthermore, even when shaft 4 of motor 3 and a suspension structureportion of the connecting portion are to be rotated, the rotationcomponent in the rotation direction of Y-axis 11 can be fixed. Then, itis possible to prevent ceiling fan main body 1 from being wound on thesuspension structure section such as a power wire for supplying electricpower to motor 3 and an anti-drop wire. This is because hanger 17 forholding ball joint 21 is provided with protrusion 19 that can beinserted into groove 20.

Furthermore, suspension device 37 having such a configuration canfacilitate suspension to hanger 17 at the time of construction and itcan be applied to an inclined ceiling.

Furthermore, by using pulley 22 in the first connecting portion, theswing component in the rotation direction of the axis of pulley 22 canbe suppressed by pulley 22 with friction reduced. Therefore, it ispossible to suppress the swing of ceiling fan main body 1 duringoperation and to facilitate suspension to a J-hook or a U-hook at thetime of construction.

Furthermore, since pulley 22 of the first connecting portion is made ofrubber, the vibration of ceiling fan main body 1 by rotation duringoperation can be absorbed and relieved.

Third Exemplary Embodiment

In accordance with a third exemplary embodiment of the presentinvention, the same reference numerals are given to the same elements asin the first exemplary embodiment and the description thereof isomitted, and only different configurations are described. The thirdexemplary embodiment of the present invention and the first exemplaryembodiment are different from each other in a configuration of a firstconnecting portion.

FIG. 6 is a side view showing a ceiling fan in accordance with the thirdexemplary embodiment of the present invention. Suspension device 47 ofceiling fan 52 includes a first connecting portion that is horizontalplane axis connecting portion 23 and a second connecting portion that ishorizontal axis connecting portion 9. The first connecting portion isrotatable around a rotation axis on the horizontal plane includingX-axis 12 and Z-axis 13. The second connecting portion is rotatable inthe direction of X-axis 12 as a rotation axis.

Horizontal plane axis connecting portion 23 that is the first connectingportion includes ball joint 21 a. Ball joint 21 a fixed to suspensionsection 15 has a substantially hemispherical shape and has a groove (notshown) on the spherical surface thereof. Connecting fitting 46 is fixedto ceiling 5, and has a notch portion and a protrusion (both are notshown). Furthermore, the notch portion has a bowl shape which movablyholds ball joint 21 a and through which suspension section 15 is allowedto pass. The protrusion can be inserted into the groove. Joint portion10 is provided with a hole (not shown).

Horizontal axis connecting portion 9 that is the second connectingportion includes a columnar axis fixed in the horizontal direction, andis rotatably hooked through the hole of joint portion 10.

That is to say, suspension device 47 has a configuration in which acolumnar axis that forms the second connecting portion and ball joint 21a that forms the first connecting portion are fixed by suspensionsection 15.

With the above-mentioned configuration, a swing component in thedirection of rotation having a rotation axis on the plane includingX-axis 12 and Z-axis 13 is suppressed by the first connecting portion.Furthermore, a swing component in the rotation direction around X-axis12 as a rotation axis is suppressed by the second connecting portion. Asa result, a swing component in the direction of rotation having arotation axis on the horizontal plane and a swing component in thedirection of rotation around X-axis 12 as a rotation axis can behandled. Therefore, the swing of ceiling fan main body 1 duringoperation can be suppressed.

Furthermore, the swing of ceiling fan main body 1 during operation istransmitted to joint portion 10 fixed to the upper part of shaft 4, thatis, the second joint portion via shaft 4 protruding to the upper part ofmotor 3. Furthermore, the swing is transmitted to the first connectingportion via suspension device 47. In this way, the swing of ceiling fanmain body 1 is not transmitted to the first connecting portion and thesecond connecting portion simultaneously. The swing is firstlytransmitted to the second connecting portion, and then to the firstconnecting portion late. Consequently, in the first connecting portionand the second connecting portion, the swing directions are opposite toeach other, the swing of ceiling fan main body 1 are partiallycancelled, and the swing of ceiling fan main body 1 during operation canbe suppressed.

Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via twoconnecting portions, that is, the first connecting portion and thesecond connecting portion. Therefore, the transmission of the vibrationof ceiling fan main body 1 is suppressed by the two movable connectingportions. As a result, the transmission of the vibration to ceiling 5 issuppressed. Thus, the occurrence of an abnormal noise on ceiling 5 canbe suppressed.

Furthermore, even when shaft 4 of motor 3 and a suspension structureportion of the connecting portion are to be rotated, the rotationcomponent in the rotation direction of Y-axis 11 can be fixed. Then, itis possible to prevent ceiling fan main body 1 from being wound on thesuspension structure section such as a power wire for supplying electricpower to motor 3 and an anti-drop wire. This is because connectingfitting 46 has a notch portion for rotatably holding ball joint 21 a anda protrusion that can be inserted into the groove.

Furthermore, suspension device 47 having such a configuration canfacilitate suspension to hanger 17 at the time of construction and itcan be applied to an inclined ceiling.

Fourth Exemplary Embodiment

In accordance with a fourth exemplary embodiment of the presentinvention, the same reference numerals are given to the same elements asin the first to third exemplary embodiments and the description thereofis omitted, and only different configurations are described. The fourthexemplary embodiment of the present invention and the third exemplaryembodiment are different from each other in a configuration of a secondconnecting portion.

FIG. 7 is a side view showing a ceiling fan in accordance with thefourth exemplary embodiment of the present invention. FIG. 8 is adevelopment view showing a principal part of a suspension device of theceiling fan. Suspension device 57 of ceiling fan 53 includes a firstconnecting portion that is horizontal plane axis connecting portion 23and a second connecting portion holding horizontal plane axis connectingportion 16.

Horizontal plane axis connecting portion 23 as the first connectingportion includes ball joint 21 a, and hanger 17 as the second connectingportion holds ball joint 21 b of horizontal plane axis connectingportion 16.

The first connecting portion is rotatable around a rotation axis on ahorizontal plane including X-axis 12 and Z-axis 13. Ball joint 21 afixed to connecting member 25 has a substantially hemispherical shapeand has groove 20 a on the spherical surface. Connecting fitting 46 isfixed to ceiling 5, and has notch portion 18 a and protrusion 19 a.Notch portion 18 a has a bowl shape which movably holds ball joint 21 aand through which connecting member 25 is allowed to pass. Protrusion 19a can be inserted into groove 20 a. Connecting fitting 46 is fixed toceiling 5, and has notch portion 18 a and protrusion 19 a.

Joint portion 10 includes ball joint 21 b. Ball joint 21 b has asubstantially hemispherical shape and has groove 20 b on the sphericalsurface. Hanger 17 includes notch portion 18 b through which shaft 4 isallowed to pass and protrusion 19 b.

That is to say, suspension device 57 has a configuration in which balljoint 21 a forming the first connecting portion is fixed to hanger 17 ofthe second connecting portion movably holding ball joint 21 b.

With the above-mentioned configuration, a swing component in thedirection of rotation having a rotation axis on the plane includingX-axis 12 and Z-axis 13 is suppressed by upper and lower connectingportions, i.e., the first connecting portion and the second connectingportion, and the swing of ceiling fan main body 1 during operation canbe suppressed.

Furthermore, the swing of ceiling fan main body 1 during operation istransmitted to joint portion 10 fixed to the upper part of shaft 4 viashaft 4 protruding to the upper part of motor 3. Furthermore, the swingis transmitted to the first connecting portion via hanger 17 forming thesecond connecting portion. In this way, the swing of ceiling fan mainbody 1 is not transmitted to the first connecting portion and the secondconnecting portion simultaneously. The swing is firstly transmitted tothe second connecting portion, and then to the first connecting portionlate. Consequently, in the first connecting portion and the secondconnecting portion, the swing directions are opposite to each other, theswing of ceiling fan main body 1 are partially cancelled, and the swingof ceiling fan main body 1 during operation can be suppressed.

Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via twoconnecting portions, that is, the first connecting portion and thesecond connecting portion. Therefore, the transmission of the vibrationof ceiling fan main body 1 is suppressed by the two movable connectingportions. As a result, the transmission of the vibration to ceiling 5 issuppressed. Thus, the occurrence of an abnormal noise on ceiling 5 canbe suppressed.

Furthermore, even when shaft 4 of motor 3 and a suspension structureportion of the connecting portion are to be rotated, the rotationcomponent in the rotation direction of Y-axis 11 can be fixed. Then, itis possible to prevent ceiling fan main body 1 from being wound on thesuspension structure section such as a power wire for supplying electricpower to motor 3 and an anti-drop wire. This is because hanger 17holding ball joint 21 b has notch portion 18 b and protrusion 19 thatcan be inserted into groove 20 b.

Furthermore, suspension device 57 having such a configuration canfacilitate suspension to hanger 17 at the time of construction and itcan be applied to an inclined ceiling.

Fifth Exemplary Embodiment

In accordance with a fifth exemplary embodiment of the presentinvention, the same reference numerals are given to the same elements asin the first to fourth exemplary embodiments and the description thereofis omitted, and only different configurations are described. The fifthexemplary embodiment of the present invention and the fourth exemplaryembodiment are different from each other in a configuration of a firstconnecting portion.

FIG. 9 is a development view showing a principal part of a suspensiondevice of a ceiling fan in accordance with the fifth exemplaryembodiment of the present invention.

Suspension device 67 of ceiling fan 54 includes a first connectingportion that is three-dimensional axis connecting portion 24 and asecond connecting portion holding horizontal plane axis connectingportion 16.

The first connecting portion that is three-dimensional axis connectingportion 24 includes ball joint 21 c fixed to connecting member 25 andhaving a substantially hemispherical shape. Ball joint 21 c is rotatablein all the three-dimensional directions, X-axis 12, Y-axis 11, andZ-axis 13 as rotation axes.

The second connecting portion is hanger 17 holding ball joint 21 brotatable around a rotation axis on the horizontal plane includingX-axis 12 and Z-axis 13.

Connecting fitting 46 fixed to ceiling 5 includes notch portion 18 a.Notch portion 18 a has a bowl shape which movably holds ball joint 21 cand through which connecting member 25 is allowed to pass.

Joint portion 10 includes a substantially hemispherical-shaped balljoint 21 b. Hanger 17 includes notch portion 18 b, and protrusion 19 bthat can be inserted into groove 20 b. Notch portion 18 b has a bowlshape which movably holds ball joint 21 b and through which shaft 4 isallowed to pass.

That is to say, suspension device 67 has a configuration in which balljoint 21 c forming the first connecting portion is fixed to hanger 17 asthe second connecting portion movably holding ball joint 21 b.

With the above-mentioned configuration, a swing component by axialtorque in the rotation direction of motor 3 and a swing component in thedirection of rotation having a rotation axis on the horizontal planeincluding X-axis 12 and Z-axis 13 are suppressed by the first connectingportion. Furthermore, a swing component in the direction of rotationhaving a rotation axis on the horizontal plane including X-axis 12 andZ-axis 13 is suppressed by the second connecting portion. In this way,since each swing component can be handled, the swing of ceiling fan mainbody 1 during operation can be suppressed.

Furthermore, the swing of ceiling fan main body 1 during operation istransmitted to joint portion 10 fixed to the upper part of shaft 4 viashaft 4 protruding to the upper part of motor 3. Furthermore, the swingis transmitted to the first connecting portion via the second connectingportion. In this way, the swing of ceiling fan main body 1 is nottransmitted to the first connecting portion and the second connectingportion simultaneously. The swing is firstly transmitted to the secondconnecting portion, and then to the first connecting portion late.Consequently, in the first connecting portion and the second connectingportion, the swing directions are opposite to each other, the swing ofceiling fan main body 1 are partially cancelled, and the swing ofceiling fan main body 1 during operation can be suppressed.

Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via twoconnecting portions, that is, the first connecting portion and thesecond connecting portion. Therefore, the transmission of the vibrationof ceiling fan main body 1 is suppressed by the two movable connectingportions. As a result, the transmission of the vibration to ceiling 5 issuppressed. Thus, the occurrence of an abnormal noise on ceiling 5 canbe suppressed.

Furthermore, by using three-dimensional axis connecting portion 24including ball joint 21 c for the first connecting portion, a structurehaving a degree of freedom in the rotation direction of all axes can beachieved. As a result, the swing component can be suppressed by balljoint 21 c with friction reduced, and therefore, the swing of ceilingfan main body 1 during operation can be suppressed. This structure canfacilitate suspension to hanger 17 at the time of construction and itcan be applied to an inclined ceiling.

Furthermore, even when shaft 4 of motor 3 and a suspension structureportion of the connecting portion are to be rotated, the rotationcomponent in the rotation direction of Y-axis 11 can be fixed. Then, itis possible to prevent ceiling fan main body 1 from being wound on thesuspension structure section such as a power wire for supplying electricpower to motor 3 and an anti-drop wire. This is because hanger 17holding ball joint 21 b includes notch portion 18 b, and protrusion 19 bthat can be inserted into groove 20 b.

Sixth Exemplary Embodiment

In accordance with a sixth exemplary embodiment of the presentinvention, the same reference numerals are given to the same elements asin the first to fifth exemplary embodiments and the description thereofis omitted, and only different configurations are described.

FIG. 10 is a development view showing a principal part of a suspensiondevice of a ceiling fan in accordance with the sixth exemplaryembodiment of the present invention. Suspension device 77 of ceiling fan55 includes a first connecting portion that is three-dimensional axisconnecting portion 24 a, and a second connecting portion holdingthree-dimensional axis connecting portion 24 b. Herein,three-dimensional axis connecting portions 24 a and 24 b have rotationaxes rotatable in all the directions in three dimensions.

Three-dimensional axis connecting portion 24 a as the first connectingportion includes substantially hemispherical-shaped ball joint 21 cfixed to connecting member 25. Connecting fitting 46 fixed to ceiling 5includes notch portion 18 a. Notch portion 18 a has a bowl shape whichmovably holds ball joint 21 c and through which connecting member 25 isallowed to pass.

Joint portion 10 includes substantially hemispherical-shaped ball joint21 c. Hanger 17 as the second connecting portion holds three-dimensionalaxis connecting portion 24 b. That is to say, hanger 17 has a bowl shapewhich movably holds ball joint 21 c and through which shaft 4 is allowedto pass.

That is to say, suspension device 77 has a configuration in which balljoint 21 c forming the first connecting portion is fixed to hanger 17 asthe second connecting portion movably holding ball joint 21 c.

With the above-mentioned configuration, a swing component due to axialtorque in the direction of the rotation of motor 3, and a swingcomponent in the direction of rotation around X-axis 12 and Z-axis 13 asa rotation axis can be suppressed by the first connecting portion andthe second connecting portion. Therefore, it is possible to suppressceiling fan main body 1 during operation.

The swing of ceiling fan main body 1 during operation is transmitted tojoint portion 10 fixed to the upper part of shaft 4 via shaft 4protruding to the upper part of motor 3. Furthermore, the swing istransmitted to the first connecting portion via hanger 17 as the secondconnecting portion. In this way, the swing of ceiling fan main body 1 isnot transmitted to the first connecting portion and the secondconnecting portion simultaneously. The swing is firstly transmitted tothe second connecting portion, and then to the first connecting portionlate. Consequently, in the first connecting portion and the secondconnecting portion, it is thought that the swing directions are oppositeto each other, the swing of ceiling fan main body 1 are partiallycancelled, and the swing of ceiling fan main body 1 during operation canbe suppressed.

Furthermore, ceiling fan main body 1 is fixed to ceiling 5 via twoconnecting portions, that is, the first connecting portion and thesecond connecting portion. Therefore, the transmission of the vibrationof ceiling fan main body 1 is suppressed by the two movable connectingportions. As a result, the transmission of the vibration to ceiling 5 issuppressed. Thus, the occurrence of an abnormal noise on ceiling 5 canbe suppressed.

Furthermore, suspension device 77 having such a configuration canfacilitate suspension to hanger 17 at the time of construction and itcan be applied to an inclined ceiling.

INDUSTRIAL APPLICABILITY

As mentioned above, the present invention can suppress the occurrence ofan abnormal noise on a ceiling and is useful as ceiling fans forhousehold use or office use.

REFERENCE MARKS IN THE DRAWINGS

-   1 ceiling fan main body-   2 blade-   3 motor-   4 shaft-   5 ceiling-   6, 46 connecting fitting-   7, 37, 47, 57, 67, 77 suspension device-   8, 9 horizontal axis connecting portion-   10 joint portion-   11 Y-axis-   12 X-axis-   13 Z-axis-   14 central axis-   15 suspension section-   16, 23 horizontal plane axis connecting portion-   17 hanger-   18 a, 18 b notch portion-   19, 19 a, 19 b protrusion-   20, 20 a, 20 b groove-   21, 21 a, 21 b, 21 c ball joint-   22 pulley-   24, 24 a, 24 b three-dimensional axis connecting portion-   25 connecting member-   50, 51, 52, 53, 54, 55 ceiling fan

1. A ceiling fan comprising: a connecting fitting fixed to a ceiling;and a ceiling fan main body suspended from the connecting fitting via asuspension device, wherein the ceiling fan main body comprises: a motorfor rotating a plurality of blades attached in a horizontal direction; ashaft protruding to an upper part of the motor, and a joint portionfixed on an upper part of the shaft, the suspension device comprises: afirst connecting portion capable of being movably mounted on theconnecting fitting; and a second connecting portion located under alower part of the first connecting portion, and the joint portion ismovably mounted on the second connecting portion.
 2. The ceiling fan ofclaim 1, wherein in the suspension device, when a central axis of theshaft is defined as Y-axis, and when coordinates of a horizontal planeperpendicular to the Y-axis are defined as X-axis and Z-axis, the firstconnecting portion is a horizontal axis connecting portion rotatable inthe direction of the X-axis as a rotation axis, and the secondconnecting portion is a horizontal axis connecting portion rotatable inthe direction of the Z-axis as a rotation axis.
 3. The ceiling fan ofclaim 2, wherein the connecting fitting has a hook shape, the firstconnecting portion includes a columnar axis which is fixed in thehorizontal direction and which the connecting fitting is hooked over,the joint portion has a hole, and the second connecting portion includesa columnar axis which is fixed in the horizontal direction and which ishooked through the hole of the joint portion.
 4. The ceiling fan ofclaim 1, wherein in the suspension device, when a central axis of theshaft is defined as Y-axis, and when coordinates of a horizontal planeperpendicular to the Y-axis are defined as X-axis and Z-axis, the firstconnecting portion is a horizontal axis connecting portion rotatable inthe direction of the X-axis as a rotation axis, and the secondconnecting portion is a hanger that holds a horizontal plane axisconnecting portion rotatable around a rotation axis on the horizontalplane.
 5. The ceiling fan of claim 4, wherein the connecting fitting hasa hook shape, the first connecting portion includes a columnar axiswhich is fixed in the horizontal direction and which the connectingfitting is hooked over, the joint portion is a ball joint having asubstantially hemispherical-shaped surface with a groove providedthereon, the second connecting portion has a bowl shape movably holdingthe ball joint and including a notch portion through which the shaft isallowed to pass and a protrusion that can be inserted into the groove.6. The ceiling fan of claim 1, wherein in the suspension device, when acentral axis of the shaft is defined as Y-axis and coordinates of ahorizontal plane perpendicular to the Y-axis are defined as X-axis andZ-axis, the first connecting portion is a horizontal plane axisconnecting portion rotatable around a rotation axis on the horizontalplane, and the second connecting portion is a horizontal axis connectingportion rotatable in the direction of the X-axis as a rotation axis. 7.The ceiling fan of claim 6, wherein the first connecting portion is aball joint fixed to the shaft and having a substantiallyhemispherical-shaped surface with a groove provided thereon, theconnecting fitting has a bowl shape movably holding the ball joint andincluding a notch portion through which the shaft is allowed to pass anda protrusion that can be inserted into the groove, the joint portion isa hook provided with a hole, and the second connecting portion includesa columnar axis hooked through the hole and fixed in the horizontaldirection.
 8. The ceiling fan of claim 3, wherein the columnar axis hasa pulley.
 9. The ceiling fan of claim 8, wherein the pulley is made ofrubber.
 10. The ceiling fan of claim 1, wherein in the suspensiondevice, when a central axis of the shaft is defined as Y-axis andcoordinates of a horizontal plane perpendicular to the Y-axis aredefined as X-axis and Z-axis, the first connecting portion is ahorizontal plane axis connecting portion rotatable around a rotationaxis on the horizontal plane, and the second connecting portion is ahanger holding a horizontal plane axis connecting portion rotatablearound a rotation axis on the horizontal plane.
 11. The ceiling fan ofclaim 10, wherein the first connecting portion is a ball joint fixed tothe shaft and having a substantially hemispherical-shaped surface with agroove provided thereon, the connecting fitting has a bowl shape movablyholding the ball joint and including a notch portion through which theshaft is allowed to pass and a protrusion that can be inserted into thegroove, the joint portion is a ball joint having a substantiallyhemispherical-shaped surface with a groove provided thereon, and thesecond connecting portion has a bowl shape movably holding a ball jointof the joint portion and including a notch portion through which theshaft is allowed to pass and a protrusion that can be inserted into thegroove.
 12. The ceiling fan of claim 1, wherein in the suspensiondevice, when a central axis of the shaft is defined as Y-axis andcoordinates of a horizontal plane perpendicular to the Y-axis aredefined as X-axis and Z-axis, the first connecting portion is athree-dimensional axis connecting portion rotatable around rotation axesin all directions in three dimensions, and the second connecting portionis a hanger holding a horizontal plane axis connecting portion rotatablearound a rotation axis on the horizontal plane.
 13. The ceiling fan ofclaim 12, wherein the first connecting portion is a ball joint fixed tothe shaft and having a substantially hemispherical shape, the connectingfitting has a bowl shape movably holding the ball joint and including anotch portion through which the shaft is allowed to pass, the jointportion is a ball joint having a substantially hemispherical-shapedsurface with a groove provided thereon, and the second connectingportion has a bowl shape movably holding a ball joint of the jointportion and including a notch portion through which the shaft is allowedto pass and a protrusion that can be inserted into the groove.
 14. Theceiling fan of claim 1, wherein in the suspension device, when a centralaxis of the shaft is defined as Y-axis and coordinates of a horizontalplane perpendicular to the Y-axis are defined as X-axis and Z-axis, thefirst connecting portion is a three-dimensional axis connecting portionrotatable around rotation axes in all directions in three dimensions,and the second connecting portion is a hanger holding athree-dimensional axis connecting portion having rotation axes in alldirections in three dimensions.
 15. The ceiling fan of claim 14, whereinthe first connecting portion is a ball joint fixed to the shaft andhaving a substantially hemispherical shape, the connecting fitting has abowl shape movably holding the ball joint and including a notch portionthrough which the shaft is allowed to pass, the joint portion is a balljoint having a substantially hemispherical shape, and the secondconnecting portion has a bowl shape movably holding a ball joint of thejoint portion and including a notch portion through which the shaft isallowed to pass.
 16. The ceiling fan of claim 5, wherein the columnaraxis has a pulley.
 17. The ceiling fan of claim 7, wherein the columnaraxis has a pulley.
 18. A ceiling fan comprising: a connecting fittingfixed to a ceiling; and a ceiling fan main body suspended from theconnecting fitting via a suspension device, wherein the ceiling fan mainbody comprises: a motor for rotating a plurality of blades attached in ahorizontal direction; a shaft protruding from an upper part of themotor, and a joint portion fixed on an upper part of the shaft, thesuspension device comprises: a first connecting portion displaceablesubstantially only in a first axial direction; and a second connectingportion capable of rotating substantially only in a plane defined by thefirst axial direction and a second axial direction perpendicular to thefirst axial direction, the joint portion is movably mounted on one ofthe first and the second connecting portions.
 19. The ceiling fan ofclaim 18, wherein the joint portion is a ball joint having asubstantially hemispherical-shaped surface with a groove providedthereon, the second connecting portion has a bowl shape movably holdingthe ball joint and including a notch portion through which the shaft isallowed to pass and a protrusion that can be inserted into the groove.